Meaning of “mine” - Learner’s Dictionary

mine

noun [ C ] uk us /maɪn/
UNDERGROUND

B2 an underground system of holes and passages where people dig out coal or other minerals

BOMB

a bomb hidden in the ground or water that explodes when it is touched:

He was killed when he drove over a mine.
→ See also gold mine

(Definition of “mine noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)